Recent progress on a memorandum of understanding (MOU) between the United States and Iran has led to a significant drop in Brent crude prices, falling from nearly $93 a barrel to the $83-$87 range. This development has direct implications for New Zealand's economy, with analysts suggesting that 91-octane petrol prices could decrease towards $2.80 per litre. This potential reduction in fuel costs is expected to lessen inflationary pressures and could provide the Reserve Bank of New Zealand (RBNZ) with more flexibility regarding its Official Cash Rate (OCR) path. Fuel accounts for approximately 4% of the Consumer Price Index (CPI) basket, and its recent increases were a key factor in previous inflation spikes.
Prior to the MOU, the RBNZ's May 2026 Monetary Policy Statement projected annual CPI inflation to peak at 4.3% in the September 2026 quarter. Treasury's Budget Economic and Fiscal Update 2026 had forecast a 4.0% peak in the June quarter, noting that the oil shock added about 1 percentage point to headline inflation. However, with the new developments, analysts like Kelly Eckhold from Westpac anticipate that lower fuel prices will reduce these inflation forecasts. Westpac has already revised its peak OCR forecast down to 4% and expects a more moderate tightening path for the RBNZ, with only one further hike projected for December MPS after a September increase. BNZ chief economist Mike Jones also sees scope for more confidence in economic activity in the second half of the year.
The conditional nature of the agreement, however, introduces uncertainties. The MOU requires the immediate reopening of the Strait of Hormuz without tolls, conditional sanctions relief for Iran, and the release of billions in frozen Iranian assets. Subsequent 60-day talks are planned to address Iran's nuclear program. While Brent crude settled at $87.33 on June 12, 2026, and dropped to $83.22 on June 15, the lowest closes since early March, analysts like Kelly Eckhold underscore a 'wait-and-see' approach. Concerns remain about the normalization of oil flow, potential Iranian control of shipping and associated fees, and the release of sanctioned funds. BNZ's Mike Jones noted that concrete evidence of tanker traffic resuming through the Strait is necessary before assuming a lasting impact, likening the announcement to previous 'false starts.' The average nationwide 91 petrol price, according to Gaspy data, was $3.15, with AA fuel specialist Terry Collins expecting better prices soon, though a return to pre-conflict levels is unlikely.
